Originally Posted by supra shaun (Post 98058)

so an o2 setup would be seprate and for monitoring purposes only

Originally Posted by supra shaun (Post 98057)

if im not mistaken the 87 7mgte doesnt use an o2 sensor

Originally Posted by supra shaun (Post 98060)

toyota o2 reference is only used by the ecu when up to temp and holding a consistant rpm, when the car is starting , cold , accelerating or deccelerating the o2 goes into an open loop and the ecu ignore's o2 reference.

Originally Posted by cre (Post 98072)

Again no, that's not entirely accurate... and are you just posting as a means of thinking out loud? The ECU references the O2 sensor the majority of the time once warmed up, including when accelerating (at up to about 70% throttle). When decelerating (coasting down; off throttle and while the RPM are above the fuel cut level) the O2 sensor isn't referenced as the fuel supply is cut altogether. When decelerating below the fuel cut level or at light throttle the O2 sensor is referenced.... and so on and so on and so on... There are a LOT of conditions to this.

Originally Posted by supra shaun (Post 98085)

well i disagree according to toyota thats not true heres a link on toyota input senor tech info http://www.autoshop101.com/forms/h24.pdf page 25 will explain how the o2 is used. my understanding is that the o2 is only used to keep egt's down while cruising and idleing, and in my opion a larger exhausts is a much better and more cost efficient way to control egt's

Originally Posted by supra shaun (Post 98085)

7mgte 475 to the rear wheels with no o2 at all unplugged and still running factory ecu and injectors and no e-manage either

Originally Posted by cre (Post 98089)

First off that article doesn't cover all the specifics for all the cars, just some of the major point... go figure, it's just a textbook. There's a group of engineers on SupraMania who've reverse engineered the complete TCCS... go talk to them about it, it's dizzying.

The O2 sensor isn't employed to reduce exhaust temps... it actually INCREASES them by leaning out the fuel mixture. Disconnect it and you'll be running in the 13's or richer and richer = cooler. EGR is employed to bring down cylinder temps.



Not buying it. You know jack shit about cars, probably haven't done any work on yours and have no idea what the people you paid to work on it did to it. The stock injectors can't supply enough fuel for the amount of air required for that kind of power, the ECU is programmed to cut fuel complete if a certain air flow is exceeded (keep reading I'm sure you'll get to this chapter soon enough and you can modify your story as needed then). Go back to whatever Mazda or Honda forum you usually troll on, your presence here is neither required nor desired.

God, all this jack assery has actually made me dizzy. Claims these cars don't even use an O2 sensor, then is suddenly an expert on how and when they do, what they're used for (which is also wrong) and he built a dragster out of his without making any mods????? :umno: